JBL JBLPA1254 4-Channel Powersports Amplifier

The JBL PA1254 is a four-channel Class D powersports amplifier designed to add dedicated amplification to marine, automotive, and off-road audio systems. Its compact footprint helps solve the common challenge of finding room for an amplifier in space-limited installations. It can power four full-range speakers or be configured for two bridged channels.

With 75 watts RMS per channel at 4 ohms, the PA1254 is suited to driving compatible speakers with controlled, full-range output. It delivers 125 watts RMS per channel at 2 ohms, while bridged operation provides 250 watts RMS to each of two 4-ohm loads. Separate front and rear level controls support balanced system tuning.

This amplifier is built for systems exposed to demanding outdoor conditions. Its ultra-compact aluminum chassis and conformal-coated circuit board support use in marine and powersports environments. The Class D design provides efficient power delivery in a small enclosure.

Flexible crossover controls allow the PA1254 to fit a range of speaker and subwoofer layouts. The front channels offer selectable full-range or high-pass operation, while the rear channels add selectable low-pass capability. Crossover points at 60, 80, and 120 Hz help divide frequencies between speakers and a subwoofer.

Both low-level RCA and high-level speaker inputs are provided for integration with aftermarket or factory-style source units. High-level installation can use the included adapters and the amplifier's DC-offset signal sensing turn-on feature. This makes the PA1254 a practical foundation for upgrading a four-speaker system or building a compact multi-channel setup.

Key Features

• Four-Channel Class D Power: Supplies efficient amplification for compatible full-range speakers.
• 75W RMS Per Channel: Delivers rated output at 4 ohms across four channels.
• Bridgeable Channel Pairs: Supports two-channel bridged operation at 4 ohms.
• Selectable Crossovers: Helps match amplifier output to speakers or subwoofers.
• High- And Low-Level Inputs: Connects with speaker-level or RCA source signals.
• Conformal-Coated Circuit Board: Adds protection for demanding outdoor installations.

Design & Installation

The PA1254 uses an ultra-compact aluminum chassis measuring 9.53 inches wide, 1.75 inches high, and 3.3 inches deep. Its conformal-coated PCB is intended for harsh-condition use, while the compact enclosure supports mounting where larger amplifiers may not fit. Power and protection indicators provide operating-status feedback.

Install the amplifier in a secure location with ventilation, avoiding a heat-sink-down orientation. Use 10 AWG power wiring, a properly fused battery connection, and a solid chassis or battery-negative ground connection. For low-level input, connect RCA cables and a remote turn-on lead; for high-level input, use the supplied adapters and set the input selector to HI.